Optical lens and virtual image display module

Abstract

An optical lens, adapted for transmitting an image light beam generated by an image display unit to at least one eye of a user. The optical lens includes a reflecting unit, an L-type lens and a diffractive optical element. The reflecting unit, the L-type lens and the diffractive optical element are disposed on a transmission path of the image light beam. The L-type lens has a first portion and a second lens portion integrally molded with each other. The first lens portion is disposed between the image display unit and the reflecting unit. The second lens portion is disposed between the reflecting unit and the eye. The image light beam is transmitted to the eye through the first lens portion, the reflecting unit, the second lens portion and the diffractive optical element to provide a virtual image. Besides, a virtual image display module is also provided.

What is claimed is: 
     
         1 . An optical lens, adapted for transmitting an image light beam generated by an image display unit to at least one eye of a user, comprising:
 a reflecting unit, disposed on a transmission path of the image light beam;   an L-type lens, disposed on the transmission path of the image light beam and having a first lens portion and a second lens portion, the second lens portion is integrally molded with the first lens portion, wherein the first lens portion is disposed between the image display unit and the reflecting unit, and the second lens portion is disposed between the reflecting unit and the eye; and   a diffractive optical element, disposed on the transmission path of the image light beam, wherein the image light beam is transmitted to the eye through the first lens portion, the reflecting unit, the second lens portion and the diffractive optical element to provide a virtual image.   
     
     
         2 . The optical lens according to  claim 1 , wherein the first lens portion has a first optical axis, the second lens portion has a second optical axis, a first included angle is between the first optical axis and the second optical axis, and the first included angle ranges about from 70 to 110 degrees. 
     
     
         3 . The optical lens according to  claim 1 , wherein the L-type lens has at least one sidewall, and the at least one sidewall is connected with the first lens portion and the second lens portion. 
     
     
         4 . The optical lens according to  claim 1 , wherein the L-type lens further has at least one positioning portion configured to install the reflecting unit. 
     
     
         5 . The optical lens according to  claim 4 , wherein an amount of the at least one positioning portion is plural, and the positioning portions are configured to install the reflecting unit and the diffractive optical element. 
     
     
         6 . The optical lens according to  claim 1 , wherein a second included angle is between the first lens portion and the second lens portion, and the second included angle ranges about from 70 to 110 degrees. 
     
     
         7 . The optical lens according to  claim 1 , wherein the diffractive optical element is disposed inside the L-type lens and adjacent to the first lens portion. 
     
     
         8 . The optical lens according to  claim 1 , wherein the diffractive optical element is disposed inside the L-type lens and adjacent to the second lens portion. 
     
     
         9 . The optical lens according to  claim 1 , wherein the diffractive optical element is disposed between the second lens portion and the eye. 
     
     
         10 . The optical lens according to  claim 1 , wherein the optical lens moves relatively to the image display unit to adjust an imaging position and an imaging frame size of the virtual image. 
     
     
         11 . A virtual image display module, disposed in front of at least one eye of a user, comprising:
 an image display unit, providing an image light beam; and   an optical lens, comprising:
 a reflecting unit, disposed on a transmission path of the image light beam; 
 an L-type lens, disposed on the transmission path of the image light beam and having a first lens portion and a second lens portion, and the second lens portion is integrally molded with the first lens portion, wherein the first lens portion is disposed between the image display unit and the reflecting unit, and the second lens portion is disposed between the reflecting unit and the eye; and 
 a diffractive optical element, disposed on the transmission path of the image light beam, wherein the image light beam is transmitted to the eye through the first lens portion, the reflecting unit, the second lens portion and the diffractive optical element to provide a virtual image. 
   
     
     
         12 . The virtual image display module according to  claim 11 , wherein the first lens portion has a first optical axis, the second lens portion has a second optical axis, a first included angle is between the first optical axis and the second optical axis, and the first included angle ranges about from 70 to 110 degrees. 
     
     
         13 . The virtual image display module according to  claim 11 , wherein the L-type lens has at least one sidewall, and the at least one sidewall is connected with the first lens portion and the second lens portion. 
     
     
         14 . The virtual image display module according to  claim 11 , wherein the L-type lens further has at least one positioning portion configured to install the reflecting unit. 
     
     
         15 . The virtual image display module according to  claim 14 , wherein an amount of the at least one positioning portion is plural, and the positioning portions are configured to install the reflecting unit and the diffractive optical element. 
     
     
         16 . The virtual image display module according to  claim 11 , wherein a second included angle is between the first lens portion and the second lens portion, and the second included angle ranges about from 70 to 110 degrees. 
     
     
         17 . The virtual image display module according to  claim 11 , wherein the diffractive optical element is disposed between the image display unit and the first lens portion. 
     
     
         18 . The virtual image display module according to  claim 11 , wherein the diffractive optical element is disposed inside the L-type lens and adjacent to the first lens portion. 
     
     
         19 . The virtual image display module according to  claim 11 , wherein the diffractive optical element is disposed inside the L-type lens and adjacent to the second lens portion. 
     
     
         20 . The virtual image display module according to  claim 11 , wherein the diffractive optical element is disposed between the second lens portion and the eye. 
     
     
         21 . The virtual image display module according to  claim 11 , wherein the optical lens moves relatively to the image display unit to adjust an imaging position and an imaging frame size of the virtual image.